This Idea is very nice but it's pretty useless too..I talk about a automat light system! Like regular street lights that turn on when its night and turns off during the day This work good when using smaller amount of redstone lamp.. but i have it in my own singelplayer and i have pretty much redstone lamps, and when it becomes night the whole game freezes like a nano second.. so if this have to work perfect and smooth you must have a really good server:P but its a sure cool thing!

And you have to digg alot under the road or where you have the lamps , I dont think you want tons of redstone up on the ground

I have one more idea! A little fun mod called Clay soldiers, Don't know if you have heard about it, but if you add it, you can build a mini arena so people can fight each other with their clay soldiers! and maybe add a betting system? so they can bet money/ diamonds/ gold etc etc..

We had a mod on one of our old servers called CraftBook which has this feature, which we are thinking of using again on BadgerCraft!There is no clay solider release for bukkit as of yet, but I used to play with it as well, and it was awesome!